<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
	.c1{
		border: 1px red solid;
		/* 设置内容向左靠齐 */
		text-align: left;
	}
	.c2{
		border: 1px red solid;
		/* 设置内容居中 */
		text-align: center;
	}
	.c3{
		border: 1px red solid;
		/* 设置内容向右靠齐 */
		text-align: right;
	}
</style>
</head>
<body>
<p>Study hard and make progress every day!</p>
<p class="c1">好好学习，天天向上</p>
<p class="c2">好好学习，天天向上</p>
<p class="c3">好好学习，天天向上</p>
</body>
</html>